Stop motion for warp knitting machines



July 11, 1950 QUICK r 2,514,719

STOP MOTION FOR WARP KNITTING MACHINES Filed March 15, 194; 2 Shee ts-Sheet 1 5 [ii l/V I/'A/TORS 00/144 1 0 Q l/lll; z. A rue/v5 01 4,

y 11, 19 0 D. QUICK EI'AL 2,514,719

STOP MOTION FOR WARP KNITTING MACHINES Fi led March 15, 1948 2 Sheets-Sheet 2 H w IN VtF/V "1 00/1 4112 u/c/r,

z. x-r fU/P/VBUZZ ATTOR/VFY Patented July 11, 1950 r STOP MOTION'CFOR WARP-.KNITTIN G .-MACHIN "Donald Quick and -LeonardiF. iTurnbull, Daisy, Tenn., asSignors. to KingsboroxSilk. Mills, .Inc.,

:Daisy, Tenn.

Application March 15, 1948;"SeriaI No. 14,846

1 Claim.

This invention'is'directed to a stop motion for warp knitting machines and particularly fast knitting machines of this type.

In the operation of machines of this character, breakage of the yarn and of the needles frequently occurs, necessitating the stoppage of the machine to permit tying of the broken thread or replacement of the broken needle to continue a proper operation, and when the operation of the machine is resumed the cloth produced ordinarily by the tying of the thread or the replacement of the needles results in the presence of bullet holes in the cloth which reduces its commercial value.

The stop motion of the present invention is designed to avoid the undue deterioration of the cloth in causing such an instant response to the cessation of the knitting operation or the breakage of a needle or thread, as to eliminate the length of time the correction of the defects necessary and hence very much finer or smaller bullet holes than ordinarily.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a diagrammatic view of the improved stop motion, the cooperating parts of the knitting machine being sufficiently shown to indicate the function of the stop motion.

Figure 2 is a similar View showing the parts in stop position.

Figure 3 is a view of the brake mechanism.

Figure 4 is a side View of the switch.

Fig. 5 is an edge view of the switch.

In the drawings, the wrap beam is indicated at I, the cloth beam at 2, the guiding and tensioning rod or bar at 3, 4 showing one of the sinkers, 5 showing one of the needles and 6 one of the thread guides disposed adjacent to and above the needle 5 and between the same and the rod 3. The shifting rod of the throw-01f mechanism as shown at 1 and 8 indicates the hand shaft of the warp knitting machine. All the described parts may be of any ordinary or conventional construction.

A warp thread 9 feeding from the beam over the tension rod which, as shown, is disposed above and substantially in the vertical plane of the guide 6 nd needle mechanism, and then vertically down and through the guide 6 and needle 5. l0 indicates a portion of the knitted cloth which winds on the beam 2.

In the light of the present invention, we provide a thread controlled automatic switch H which governs a control circuit [2, one such switch being provided for each warp thread and coacting elements of the knitting mechanism.

I normally inclined slightly from the vertical.

opening slot M for the entrance of the thread, which slot terminates at the upper end in an elongated opening l5 for the uninterrupted movement of the thread. The lower end of the bar I3 is mounted upon a fixed pivot rod [6, and is By means of this it is not quick-starting when released but is accelerated into circuit closing position when there is a sudden slackening.

The switch ll engages the feeding thread 9 between the tension bar 3 and a stationary bar H. A certain degree of slack in the thread is in the individual threads due to ordinary knitting operations, but the switch is not provided to overcome this because it does not prevent operation of the knitting machine, for a certain degree of slack is permitted without injury and it is not necessary to operate the switch at such times. Where, however, that degree of slack is present tending to imperfect operation the switch is intended for operation to stop the machine and permit correction of the defects. There thus exists a degree of slack which may be said to be permissible and that which the switch is operated to interrupt the operation of the machine, the switch serving at intermediate degrees of slackness as a tensioning device, as will be evident. Thus it will be understood that the arm I 3 under certain slack conditions of the thread has a movement to compensate for and take up slack short of slack-switch movement and thus the machine continues in operation without resulting in the operation of the switch. However, the slack thread which would cause the production of imperfect cloth is such as to cause the throw of the switch and the stopping of the machine.

By the arrangement of the switches II to engage the thread portions ahead of the tension bar and their inclination as above described, a supplemental tensioning means for medium slack is provided, beyond the safe limit of which the switch functions as such. Furthermore, in the event of the breakage of an individual thread and the operation of the machine, the operater may engage each thread with its switch without ascending to the top of the machine each time a break occurs, and the invention therefore affords greater convenience in the particulars noted to save time and labor costs in the operation of r the machine.

The details of controlling the operation of the machine by the switch are illustrated to follow the cloth beam and the tensioning bar, a brake;

ing mechanism for arresting movement of the machine, the same being yieldingly impelled to."

release position, electrically actuated means "for effecting braking position of the braking mechae nism, and an energizing circuit for said electrical means; the provision of a switch which controls the energizing circuit, said. switch being posi-;

tioned between the warp beam and the tensioning bar and comprising a straight flat bar pivoted" at its lower end and having its upper formed with a thread eye from which extends a downwardly directed slot opening on the edge of the bar, the

4 latter being slightly inclined from the vertical and being in open position when a warp thread passes the eye thereof.

DONALD QUICK. LEONARD F. TURNBULL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS f"l li'imber Name Date 1,047,080 Koch Dec. 10, 1912 1,942,524 a Welch-et a1 Jan. 9, 1934 ;,1,971,427 Quick et a1 Aug. 28, 1934 2,010,928 Quick Aug. 13, 1935 2,438,365. Hepp et a1. Mar. 23, 1948 FOREIGN PATENTS Number Country Date 774,501 France Sept. 24, 1934 

